Home › Engineering Calculators › Electrical Calculators Calculators V = I x R Live calculator for voltage, current and resistance checks built around V = I x R. S ~= k x I x L / ΔU Electrical sizing tool for choosing a practical conductor cross-section from current, run length, phase type and allowable voltage drop. ΔU = I x R Electrical project tool for checking voltage loss, percent drop and end-of-line voltage on a selected cable run. I = P / (V x cos φ) Electrical selection tool for converting power into current using phase type, voltage, power factor and efficiency. P = V x I x cos φ Project tool for estimating electrical power from line current together with voltage, phase type, power factor and efficiency. I = P / (√3 x V x cos φ x η) Selection tool for estimating approximate full-load motor current from motor power, voltage, power factor and efficiency. More engineering calculators